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September testing at UCSB's Garner Valley Site



Fiber-Optic Intelligent Distributed Acoustic Sensor (iDASTM) Technology Tested at NEES@UCSB's Garner Valley Site.

The University of Wisconsin-Madison with funding from NSF’s Geoengineering Program and industry partner Silixa, Ltd plan to use the NEES@UCLA's mobile shakers to investigate new fiber-optic sensing technology. The field experiments to take place the week of September 9 are designed to further the scientific and engineering applications of Silixa’s ‘intelligent’ Distributed Acoustic Sensor (iDAS™) system, which measures the true acoustic field by revealing the amplitude, frequency and phase along many kilometers of fiber.  For the experiment, 700-meters of fiber-optic cable have been installed in a shallow trench at NEES@UCSB’s Garner Valley site near Lake Hemet.  The researchers will use heavy-duty UCLA shakers and a truck-mounted shaker to study the ground motions recorded by iDAS together with conventional seismometers installed at many points along the fiber-optic layout.  Recordings from naturally-occurring earthquakes and the ambient ‘noise’ field will also be made to develop techniques for locating seismic sources and characterizing the soil layers underground.

Site PI Jamie Steidl is pleased to support this innovative work. "This project is a great example of testing new technologies and equipment site collaboration," he said.

The project is Fiber-Optic Strain Monitoring of Rock Masses. Data from the test will be available on the NEEShub.